A pearl is created when a piece of grit lodges in the shell. The shellfish covers the grit with a layer of shell lining known as mother-of-pearl, or nacre. The pearl that is formed removes the irritating grit.
Home » Kids Questions & Answers » Health Questions & Answers » How are the pearls that come from oysters and some other shellfish made?
Pearls are some of the most beautiful gems we know, and very expensive to buy. …